Evaporative cooler



FIG. 1 is a perspective view of an evaporative cooler showing our new design;

FIG. 2 is a top plan view thereof; and

FIG. 3 is a side elevational view thereof.

The fragmentary broken line showing of a roof in FIG. 1 is for purposes of illustration only. 

The ornamental design for an evaporative cooler, as shown and described. 